1/*
2 * udbg interface to hvc_console.c
3 *
4 * (C) Copyright David Gibson, IBM Corporation 2008.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
19 */
20
21#include <linux/console.h>
22#include <linux/delay.h>
23#include <linux/err.h>
24#include <linux/init.h>
25#include <linux/moduleparam.h>
26#include <linux/types.h>
27#include <linux/irq.h>
28
29#include <asm/udbg.h>
30
31#include "hvc_console.h"
32
33struct hvc_struct *hvc_udbg_dev;
34
35static int hvc_udbg_put(uint32_t vtermno, const char *buf, int count)
36{
37	int i;
38
39	for (i = 0; i < count && udbg_putc; i++)
40		udbg_putc(buf[i]);
41
42	return i;
43}
44
45static int hvc_udbg_get(uint32_t vtermno, char *buf, int count)
46{
47	int i, c;
48
49	if (!udbg_getc_poll)
50		return 0;
51
52	for (i = 0; i < count; i++) {
53		if ((c = udbg_getc_poll()) == -1)
54			break;
55		buf[i] = c;
56	}
57
58	return i;
59}
60
61static const struct hv_ops hvc_udbg_ops = {
62	.get_chars = hvc_udbg_get,
63	.put_chars = hvc_udbg_put,
64};
65
66static int __init hvc_udbg_init(void)
67{
68	struct hvc_struct *hp;
69
70	if (!udbg_putc)
71		return -ENODEV;
72
73	BUG_ON(hvc_udbg_dev);
74
75	hp = hvc_alloc(0, 0, &hvc_udbg_ops, 16);
76	if (IS_ERR(hp))
77		return PTR_ERR(hp);
78
79	hvc_udbg_dev = hp;
80
81	return 0;
82}
83device_initcall(hvc_udbg_init);
84
85static int __init hvc_udbg_console_init(void)
86{
87	if (!udbg_putc)
88		return -ENODEV;
89
90	hvc_instantiate(0, 0, &hvc_udbg_ops);
91	add_preferred_console("hvc", 0, NULL);
92
93	return 0;
94}
95console_initcall(hvc_udbg_console_init);
96